Yes, and every person I've come across who uses IE is not the target audience for my games. Maybe if I were doing angry birds or the likes, but I'm interested in a more learned audience. I don't make casual games, and IE is for the casual user, which every gamer I know uses the "IE is good for downloading another browser" line when discussing such a topic. If people spend too much time trying to make things compatible with Microsoft platforms, that would make them all look like jerks the past 20 years for not caring about anything _but_ Microsoft platforms. It's easier to make things for every other platform, and if you have the time, THEN you release for Microsoft, or Nintendo, or whoever you have to get all special for. Target the biggest audience first, and IE is not part of that target.
I'm glad you guys are interested in appealing to senses for evident customer bases, but it's important to also know your base. Just because a large group of people still have CD Players, it would be silly to try to sell them MP3's if they're stuck on the CD, won't it? It's just music, so what's the big deal? It's not compatible, and to make it compatible means the customer would have to suffer through making it so, no matter how easy I make it. (You can relate the same situation to how easy it is to play Ultima Online in Windows, but in Linux you need the Linux client which was developed but not kept up with).
It just so happens Microsoft's IE and Windows platforms are only in the game because they have the money to be in the game, not because they have anything to bring to the table. I've seen this before with RIM, and called it ages ago, no one believed me, but where are they now? Just because we can still see Betelgeuse doesn't mean it hasn't gone supernova yet.